Tuna Niçoise Sandwiches with Olive Mayonnaise

Ingredients

• 0.5 teaspoon anchovy paste 
• 0.5 teaspoon coarsely ground pepper 
• 2  hard-cooked eggs chopped
• 0.3 cup kalamata olives pitted finely chopped
• 0.5 cup mayonnaise 
• 2 tablespoons olive oil 
• 8 slices potato bread farls 
• 0.3 cup onion red chopped
• 12 ounce solid tuna white flaked drained canned
• 1 cup spinach leaves loosely packed
• 8 slices tomatoes 
• 2 teaspoons citrus champagne vinegar 

Equipment

• bowl

Directions

1. Combine first 3 ingredients in a small bowl.
2. Combine tuna and next 5 ingredients in a medium bowl; set aside.
3. Spread mayonnaise mixture on one side of each bread slice. Divide arugula evenly among 4 bread slices; top with tomato slices.
4. Spread tuna mixture evenly over tomato slices; top with remaining 4 bread slices.